Modeling time-dependent mechanical behavior of hard rock considering excavation-induced damage and complex 3D stress states  

作　　者：Peiyang Yu Xiuli Ding Peng-Zhi Pan Shuting Miao Zhaofeng Wang Shuling Huang 

机构地区：[1]Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan,430010,China [2]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China [3]University of Chinese Academy of Sciences,Beijing,100049,China [4]Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences,Potsdam,Germany

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第10期4046-4065,共20页岩石力学与岩土工程学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52125903);the China Postdoctoral Science Foundation(Grant No.2023M730367);the Fundamental Research Funds for Central Public Welfare Research Institutes of China(Grant No.CKSF2023323/YT).

摘　　要：To investigate the long-term stability of deep rocks,a three-dimensional(3D)time-dependent model that accounts for excavation-induced damage and complex stress state is developed.This model comprises three main components:a 3D viscoplastic isotropic constitutive relation that considers excavation damage and complex stress state,a quantitative relationship between critical irreversible deformation and complex stress state,and evolution characteristics of strength parameters.The proposed model is implemented in a self-developed numerical code,i.e.CASRock.The reliability of the model is validated through experiments.It is indicated that the time-dependent fracturing potential index(xTFPI)at a given time during the attenuation creep stage shows a negative correlation with the extent of excavationinduced damage.The time-dependent fracturing process of rock demonstrates a distinct interval effect of the intermediate principal stress,thereby highlighting the 3D stress-dependent characteristic of the model.Finally,the influence of excavation-induced damage and intermediate principal stress on the time-dependent fracturing characteristics of the surrounding rocks around the tunnel is discussed.

关 键 词：Hard rock Excavation damage Complex stress state Three-dimensional(3D)time-dependent model 

分 类 号：TU45[建筑科学—岩土工程]